Others show "Nanita ea."
Which is correct?
What does 'ea' mean?
Was this a Christmas carol prior to its becoming a lullaby? Just
trying to understand the history of this lovely music. Did this
melody originate in Spain or in the New World?
Gracias y Feliz Navidad.

Was is a carol first, and then the lullaby or vice versa?
I did see a few comments on youtube - arguing the 'ea' vs. 'ella'.
Could 'ea' be archaic, maybe? Or regional?